for ivory isn't limited to one religion. in asia, groups of christians, buddhists and muslims all covet it. "national geographic's" two-year investigation revealed that governments are often complicit in the purchasing and processing of ivory. the magazine also found that ivory traffickers are operating with impunity, thwarting poorly written international laws and ineffective organizations designed to clamp down on the illegal trade. in countries where corruption is widespread, ivory that is seized by the authorities, often disappears. in 2006 a government storeroom in thailand, like this one in bangkok, was raided, and the tusks replaced with plastic replicas. meanwhile, in 2011 more elephants were poached than in any year since a global ban on ivory trading was passed in 1989. they were killed for their tusks and tusks alone. the reporter on the story, brian christie, joins us now, thanks for being with us. pleasure being here, hari. >> sreenivasan: didn't the planet say ivory trade was illegal back in 1990? >> it did. it did. and as soon as it did elephant populations began to recover.